<style>div { position:absolute; width:200px; height:200px; }</style>
<div style="background: radial-gradient(circle farthest-side at 40px 80px, white, black 200px); top:10px; left:10px;"></div>
<div style="background: radial-gradient(farthest-side circle at 160px 80px, white, black 200px); top:10px; left:220px;"></div>
<div style="background: radial-gradient(circle farthest-side at 80px 40px, white, black 200px); top:220px; left:10px;"></div>
<div style="background: radial-gradient(farthest-side circle at 80px 160px, white, black 200px); top:220px; left:220px;"></div>
<div style="background: -moz-radial-gradient(60px 80px 90deg, farthest-corner, white, black 120px); top:430px; left:10px;"></div>
<div style="background: -moz-radial-gradient(140px 80px 90deg, farthest-corner, white, black 120px); top:430px; left:220px;"></div>
<div style="background: -moz-radial-gradient(80px 60px 90deg, ellipse farthest-corner, white, black 140px); top:640px; left:10px;"></div>
<div style="background: -moz-radial-gradient(80px 140px 90deg, ellipse farthest-corner, white, black 140px); top:640px; left:220px;"></div>
